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# charencode.py - miscellaneous character encoding
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#
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# Copyright 2005-2009 Olivia Mackall <olivia@selenic.com> and others
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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import array
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from .. import pycompat
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def isasciistr(s):
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try:
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s.decode('ascii')
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return True
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except UnicodeDecodeError:
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return False
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def asciilower(s):
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"""convert a string to lowercase if ASCII
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Raises UnicodeDecodeError if non-ASCII characters are found."""
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s.decode('ascii')
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return s.lower()
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def asciiupper(s):
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"""convert a string to uppercase if ASCII
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Raises UnicodeDecodeError if non-ASCII characters are found."""
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s.decode('ascii')
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return s.upper()
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_jsonmap = []
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_jsonmap.extend(b"\\u%04x" % x for x in range(32))
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_jsonmap.extend(pycompat.bytechr(x) for x in range(32, 127))
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_jsonmap.append(b'\\u007f')
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_jsonmap[0x09] = b'\\t'
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_jsonmap[0x0A] = b'\\n'
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_jsonmap[0x22] = b'\\"'
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_jsonmap[0x5C] = b'\\\\'
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_jsonmap[0x08] = b'\\b'
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_jsonmap[0x0C] = b'\\f'
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_jsonmap[0x0D] = b'\\r'
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_paranoidjsonmap = _jsonmap[:]
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_paranoidjsonmap[0x3C] = b'\\u003c' # '<' (e.g. escape "</script>")
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_paranoidjsonmap[0x3E] = b'\\u003e' # '>'
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_jsonmap.extend(pycompat.bytechr(x) for x in range(128, 256))
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def jsonescapeu8fast(u8chars, paranoid):
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"""Convert a UTF-8 byte string to JSON-escaped form (fast path)
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Raises ValueError if non-ASCII characters have to be escaped.
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"""
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if paranoid:
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jm = _paranoidjsonmap
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else:
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jm = _jsonmap
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try:
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return b''.join(jm[x] for x in bytearray(u8chars))
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except IndexError:
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raise ValueError
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_utf8strict = r'surrogatepass'
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def jsonescapeu8fallback(u8chars, paranoid):
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"""Convert a UTF-8 byte string to JSON-escaped form (slow path)
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Escapes all non-ASCII characters no matter if paranoid is False.
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"""
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if paranoid:
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jm = _paranoidjsonmap
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else:
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jm = _jsonmap
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# non-BMP char is represented as UTF-16 surrogate pair
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u16b = u8chars.decode('utf-8', _utf8strict).encode('utf-16', _utf8strict)
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u16codes = array.array('H', u16b)
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u16codes.pop(0) # drop BOM
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return b''.join(jm[x] if x < 128 else b'\\u%04x' % x for x in u16codes)
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